中上扬子区海相层系烃源岩硫含量分布与硫同位素组成特征

Content distribution and isotopic composition characteristics of sulfur in marine source rocks in Middle-Upper Yangtze region

付小东 邱楠生 秦建中 滕格尔 刘文汇 王小芳

Fu Xiaodong Qiu Nansheng Qin Jianzhong Tenger Liu Wenhui Wang Xiaofang

中国石油大学(北京),北京102249 中国石油杭州地质研究院,杭州310023 中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126

China University of Petroleum, Beijing 102249, China Hangzhou Research Institute of Petroleum Geology, PetroChina, Hangzhou, Zhejiang 310023, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

中上扬子区海相层系烃源岩相对该区陆相烃源岩总体富硫，且不同层位、同层位不同岩性烃源岩硫含量差异明显，总硫含量与总有机碳含量间存在一定的正相关性。烃源岩中各种形态硫以有机硫和无机黄铁矿硫为主，单质硫在海相烃源岩中较常见，但占总硫含量的比例低。海相烃源岩硫同位素变化范围大，主要在-35‰~30‰，有机硫和单质硫同位素相对偏负，均值分别为-8.68‰和-5.65‰；黄铁矿和硫酸盐硫同位素则相对偏重，均值分别为4.15‰和2.19‰。

Marine hydrocarbon source rocks in the Middle-Upper Yangtze region are rich in sulfur compared with terrestrial source rocks. Significant differences exist in sulfur content of source rocks in different formations or in the same formation with different lithology. There are obvious positive correlations between sulfur content and TOC of source rock. Sulfur in marine source rock exists mainly in form of organic sulfur and pyritic sulfur. Elemental sulfur is common in soluble extracts of marine source rock, but it has a variable content and occupies a lower percentage of total sulfur content. The δ34S value of sulfur in marine source rock has a broad variation range from -35‰ to 30‰. The average values of δ34S of organic sulfur and elemental sulfur are negative with -8. 68‰ and -5. 65‰ respectively, and those of pyritic sulfur and sulfate sulfur are positive with 4. 15‰ and 2. 19‰ respectively.

国家重点基础研究发展计划（973计划）（2012CB214801）、石油化工联合基金（40839910）资助。

https://doi.org/10.11781/sysydz201305545